package com.sky.aspect;

import com.sky.annotation.AutoFill;
import com.sky.constant.AutoFillConstant;
import com.sky.context.BaseContext;
import com.sky.enumeration.OperationType;
import lombok.extern.slf4j.Slf4j;
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.Pointcut;
import org.aspectj.lang.reflect.MethodSignature;
import org.springframework.stereotype.Component;

import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.time.LocalDateTime;

/*
自定义切面类
 */
@Aspect
@Component
@Slf4j
public class AutoFillAspect {
    //切入点
    @Pointcut("execution(* com.sky.mapper.*.*(..)) " +
            "&& @annotation(com.sky.annotation.AutoFill)")
    public void autoFillPointCut() {

    }

    @Before("autoFillPointCut()")
    public void autoFill(JoinPoint joinPoint) throws NoSuchMethodException, InvocationTargetException, IllegalAccessException {
        log.info("开始进行公共字段自动填充");
        //获取当前被拦截的方法上的数据库操作类型
        MethodSignature methodSignature = (MethodSignature) joinPoint.getSignature();
        AutoFill autoFill = methodSignature.getMethod().getAnnotation(AutoFill.class);
        OperationType operationType = autoFill.value();

        //获取到当前被拦截的方法的参数--实体对象
        Object[] args = joinPoint.getArgs();
        if(args==null || args.length==0){
            return;
        }
        Object entity=args[0];
        LocalDateTime now = LocalDateTime.now();
        Long currentId= BaseContext.getCurrentId();
        if(operationType==OperationType.INSERT){
            //通过反射为4个字段赋值
           Method setCreateTime= entity.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_TIME,LocalDateTime.class);
           Method setUpdateTime= entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME,LocalDateTime.class);
            Method setCreateUser= entity.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_USER,Long.class);
            Method setUpdateUser= entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER,Long.class);
            setCreateTime.invoke(entity,now);
            setUpdateTime.invoke(entity,now);
            setCreateUser.invoke(entity,currentId);
            setUpdateUser.invoke(entity,currentId);

        }else if(operationType==OperationType.UPDATE){
            Method setUpdateTime= entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME,LocalDateTime.class);
            Method setUpdateUser= entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER,Long.class);
            setUpdateTime.invoke(entity,now);
            setUpdateUser.invoke(entity,currentId);
        }


        //准备赋值的数据

        //根据当前不同的操作类型，为对应的属性通过反射来赋值
    }
}
